Malicious PDF — malware analysis report

Static analysis result for SHA-256 8234cb9a1020876b…

MALICIOUS

PDF

93.4 KB Created: 2021-02-12 14:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 861fe82048bbb643206f10c557dc878b SHA-1: a3055a2b0dce1329c09b720f0c8eb0e9e501ee0d SHA-256: 8234cb9a1020876b518fcc23083937ec2374c933545708ef5cd977e2d88c4285
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with several pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/wix?keyword=zelda+level+5+stuck PDF link annotation
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/ed61c.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/ggijwgc/love_and_respect_conference_colleyville.pdfIn PDF document text
    • https://gisodotok.weebly.com/uploads/1/3/5/9/135971357/84eadd1d6a064ca.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/jfigjjk/muviz_navbar_music_visualizer_apk.pdfIn PDF document text
    • https://ribavazo.weebly.com/uploads/1/3/5/3/135322422/9df529e52104.pdfIn PDF document text
    • http://xarusogu.22web.org/apply_texas_essay_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_601bdd1402371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5fee85dc10e40.pdfIn PDF document text
    • http://falutaburifa.iblogger.org/gta_5_all_cheat_codes_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/gh1gf56/71748291125.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422914/normal_5ffd5454dd830.pdfIn PDF document text
    • https://kowokilu.weebly.com/uploads/1/3/0/7/130740572/3925785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nitatotol/c_i_d_episode_hd.pdfIn PDF document text
    • http://nitesegu.epizy.com/boney_m_christmas_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/kijajanezufogunasepumumo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 4660 bytes
SHA-256: 7f212e0da18e01ed618d4a36b059f944dc56d2b5f0a2b5ccf78bd4f8c8e3aa6e
font_01_sfnt_off00013617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13617 10648 bytes
SHA-256: 99bedbc38464bf7bf5df416fd7bc86aa7f193f02433ccf39ea294b73148bb8f8
font_02_sfnt_off00015a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A50 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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